JQuery Interview Questions

How can we apply css in odd childs of parent node using JQuery library.

$(”tr:odd”).css(”background-color”, “#bbbbff”);

How can we apply css in even childs of parent node using JQuery library.

$(”tr:even”).css(”background-color”, “#bbbbff”);

How can we apply css in last child of parent using JQuery library.

$(”tr:last”).css({backgroundColor: ‘yellow’, fontWeight: ‘bolder’});

How can we modify css class using JQuery library.

Suppose that Css class has following defination
.class
{
font-size:10px;
font-weight:normal;
color:#000000;
}

now we want to add border property on above class, so we should follow below code.

$(“.class”).css(“border”,”1px solid blue”);
Where $(“.class”) name of css class. Now .class will automatically add border property in his class definition.

How can we apply css in div element using JQuery library.

This is example to apply css on a div element which have id name myDivId.
$(”#myDivId “).css(”border”,”3px solid red”);
To apply css on all div elements use below code.$(“div”).css(“border”,”3px solid red”);

Where$(“div”) pointing all div elements in the page.For You need to use.$(”P”) on above code.

How can we submit a form by ajax using Jquery.

Please follow below code to submit a form by ajax using jquery

$(‘#formid).submit(function() {
$.ajax({
type: “POST”,
url: “back.php”,
data: “name=php&location=india”,
success: function(msg) {
alert( “Data Saved: ” + msg );
}
});
}

Where formid is the form ID.”POST” is the method by which you want to send data.You can also use “GET” method.”back.php” is the php file which you want to call.”name=php&location=india” This is values of control. success: function(msg){ alert (“Data Saved: ” + msg); } This is a success function, This will execute after success of you post.Often in Ajax back.php does not refresh because this is cached by browser. To avoid this issue add [cache: false,] in above code.Loads data synchronously. Blocks the browser while the requests is active. It is better to block user interaction by other means when synchronization is necessary.

To avoid this issue add [async: false,] in above code.

How can we get value of textbox in jquery.

Include jquery library in the head section of page. Then use below code.
$(“#id”).val();
jQuery(“#id”).val();

What is Jquery? How Jquery will work?

Jquery is lightweight javascript library file.
Jquery run in all browsers.
Jquery is client side scripting language.
Jquery browser depended framework.
Jquery developed by javascript.

Jquery combined with other library?

Jquery combined with other java script libraries like prototype, mootools that time Jquery coding will be conflict with other libraries.
So that time use this command for non -conflict jquery with other java script libraries.
jQuery.noConflict();